#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<functional>
#include<vector>
#include<queue>
#include<stack>
#include<set>
#include<map>
using namespace std;
#define MOD 1000000007
#define f(i,n) for(int i=0;i<int(n);i++)
#define N 200000


int main(){
	int n, k;
	int w, x, y, z;
	int s, ans;
	bool v = true;
	s = 0;
	k = 1;
	ans = 0;
	scanf("%d %d %d %d",&w, &x, &y, &z);

	if(z>=10)printf("Impossible\n");
	else{
		f(i, x){
			s++;
			if (s > 100){
				k = k * 2;
				s -= 100;
			}
			ans += (k*50);
		}
		f(i, w){
			s++;
			if (s > 100){
				k = k * 2;
				s -= 100;
			}
			ans += (k * 100);
		}

		printf("Possible\n");
		printf("%d\n", ans);
	}


	return 0;
}